RewriteCond %{HTTP_REFERER} xxx\.com [NC,OR]
RewriteCond %{HTTP_REFERER} www\.xxx\.com [NC,OR]
RewriteCond %{HTTP_REFERER} ^xxx1\.com [NC,OR]
RewriteCond %{HTTP_REFERER} www\.xxx1\.com [NC,OR]
RewriteCond %{HTTP_REFERER} xxx2\.com [NC,OR]
RewriteCond %{HTTP_REFERER} www\.xxx2\.com [NC]
RewriteRule .* - [F]

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